42 U.S.C. § 300i-1 : US Code - Section 300I-1: Tampering with public water systems

    (a) Tampering
      Any person who tampers with a public water system shall be
    imprisoned for not more than 20 years, or fined in accordance with
    title 18, or both.
    (b) Attempt or threat
      Any person who attempts to tamper, or makes a threat to tamper,
    with a public drinking water system be imprisoned for not more than
    10 years, or fined in accordance with title 18, or both.
    (c) Civil penalty
      The Administrator may bring a civil action in the appropriate
    United States district court (as determined under the provisions of
    title 28) against any person who tampers, attempts to tamper, or
    makes a threat to tamper with a public water system. The court may
    impose on such person a civil penalty of not more than $1,000,000
    for such tampering or not more than $100,000 for such attempt or
    threat.
    (d) "Tamper" defined
      For purposes of this section, the term "tamper" means - 
        (1) to introduce a contaminant into a public water system with
      the intention of harming persons; or
        (2) to otherwise interfere with the operation of a public water
      system with the intention of harming persons.